BERKELEY, Calif., Aug. 4, 2008 (PRIME NEWSWIRE) -- XOMA Ltd. (Nasdaq:XOMA), a leader in the discovery and development of antibody therapeutics, announced that the Company will host a conference call and webcast on Thursday, August 7, 2008 at 4:30 p.m. Eastern time to discuss second quarter 2008 financial results and provide a general business update.